4in Pyramidal Polyurethane Foam Anechoic Chamber Absorber Tile Composition: carbon and fire retardant chemical loaded polyurethane foamWorking Temperature: -85°F to 176°F (-50°C to +80°C)Environment: Indoor UseFire Retardancy: Certified Independent Lab Test Data to NRL 8093 Tests 1, 2 & 3Optional Test Data For UL94 and DIN 4102-B2Power Typical Power Handling: 1kW/m² Dimensions A B C D E/F Total Height Pyramid Base Pyramid Height Base Height Base Size # Pyramids 4in 101.6mm 1.26in 32mm 3.07in 78mm .98in 25mm 20x20in 196 per Absorber Reflectivities Reflectivity Normal frequency (GHz) 0.1 Ghz 0.2 Ghz 0.3 Ghz 0.5 Ghz 1.5 Ghz 3 Ghz 5 Ghz 10 Ghz 15 Ghz 40 Ghz Reflectivity (-dB) at normal incidence - - - - 15 30 35 40 45 50 Frequently Asked Questions What frequency range does the 4in absorber cover? The 4in absorber provides effective absorption starting from 1 GHz, with -20 dB reflectivity at 1 GHz improving to -50 dB at 40 GHz. How quickly does the 4in absorber ship? The 4in absorber is in stock and ships within 1-2 business days from our California warehouse. What are dB Absorber pyramidal absorbers made of? Our absorbers are made of carbon and fire retardant chemical loaded polyurethane foam, volumetrically loaded for consistent electromagnetic properties throughout the material. Are your absorbers fire rated? Yes, all our absorbers are certified to NRL 8093 Tests 1, 2 & 3 fire safety standards. Optional test data is available for UL94 and DIN 4102-B2 compliance. What is the operating temperature range? Our absorbers operate from -85°F to 176°F (-50°C to +80°C), suitable for standard indoor testing environments. .faq-section details { margin-bottom: 0.75em; border: 1px solid #e5e5e5; border-radius: 4px; padding: 0; } .faq-section summary { padding: 1em; cursor: pointer; font-weight: 600; list-style: none; } .faq-section summary::-webkit-details-marker { display: none; } .faq-section summary::before { content: "+"; margin-right: 0.75em; font-weight: bold; } .faq-section details[open] summary::before { content: "−"; } .faq-section details p { padding: 0 1em 1em 1em; margin: 0; color: #666; line-height: 1.6; }
